Lukaku doesn't believe they need additional players like Sancho.
"If you buy another striker, what are you going to do with Anthony [Martial]?" Lukaku quizzed The Times. "He's not being the No 9 at a great club.
"Give him the full season to confirm what he did last year instead of bringing in someone big to disrupt the chemistry in the dressing room.
"Then you have Mason's (Greenwood) transition that is going to happen any time soon from right wing to No 9, and Mason is a killer. I've seen him first hand. He's got something."